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<title>ARM ARMv8-M Security Extensions (Using the GNU Compiler Collection (GCC))</title>

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<h4 class="subsection" id="ARM-ARMv8_002dM-Security-Extensions-1"><span>6.60.9 ARM ARMv8-M Security Extensions<a class="copiable-link" href="#ARM-ARMv8_002dM-Security-Extensions-1"> &para;</a></span></h4>

<p>GCC implements the ARMv8-M Security Extensions as described in the ARMv8-M
Security Extensions: Requirements on Development Tools Engineering
Specification, which can be found at
<a class="uref" href="https://developer.arm.com/documentation/ecm0359818/latest/">https://developer.arm.com/documentation/ecm0359818/latest/</a>.
</p>
<p>As part of the Security Extensions GCC implements two new function attributes:
<code class="code">cmse_nonsecure_entry</code> and <code class="code">cmse_nonsecure_call</code>.
</p>
<p>As part of the Security Extensions GCC implements the intrinsics below.  FPTR
is used here to mean any function pointer type.
</p>
<div class="example smallexample">
<pre class="example-preformatted">cmse_address_info_t cmse_TT (void *);
cmse_address_info_t cmse_TT_fptr (FPTR);
cmse_address_info_t cmse_TTT (void *);
cmse_address_info_t cmse_TTT_fptr (FPTR);
cmse_address_info_t cmse_TTA (void *);
cmse_address_info_t cmse_TTA_fptr (FPTR);
cmse_address_info_t cmse_TTAT (void *);
cmse_address_info_t cmse_TTAT_fptr (FPTR);
void * cmse_check_address_range (void *, size_t, int);
typeof(p) cmse_nsfptr_create (FPTR p);
intptr_t cmse_is_nsfptr (FPTR);
int cmse_nonsecure_caller (void);
</pre></div>

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